Lunch box



FIG. 1 is a perspective view of a lunch box showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is rear elevation view thereof; and,

FIG. 7 is a perspective view thereof with the side compartment in an open position. 

The ornamental design for a lunch box, as shown and described. 